EXAMPLES FROM THE WEB FOR CHUGGING
Still the only reply to his monologue was the chugging of the engine.
The last of the motors were chugging up the driveway as he left.
This he could hear not far away, chugging slowly on in front of him.
A little later they were chugging away in the speedy Pickerel.
What he heard was the far off chugging of an automobile engine.
At four o'clock the next morning we are awakened by the chugging of the tug.
A little later they were chugging into the even calmer cove.
Suddenly far down the road she heard the chugging of an automobile.
Sorrowfully he watched the chugging car out of sight, up the drive.
Then pretty soon I couldn't hear the chugging any more at all.